Metal-spraying device



Julyls, 1929.

C. M. SAEGER METAL SPRAYING DEVICE 3 Sheets-Sheet 1 Filed May 8, 1925 lllllllll l.

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July 16, 1929. c. M. sAr-:GER, JR

mm1. sPnAYING DEvIE I 3 Sheet-ssheet 2 Filed May 8, 1925 July 16, 1929.c. M. sAEGER, JR

METAL SPRAYING DEVICE 5 Sheets-Sheet -3 Filed May 8, 1925 ramal July16.1929.

UNITED 'STATES CHARLES MARSHALL SAEG'ER, JR., 0F WASHD-GTON', DISTRICTOF COLUMBIA.

METAL-SPRAYING DEVICE.

Application tiled Y May 8,

This invention relates in general to the metal spraying devices and moreparticularly to a metal spray device in which. the metal to be sprayed1s meltedby electric induction.

It is the prime object of my' invention to provide a metal spraydevice1n ywhich 'the metal to be sprayed is melted by induction, using highfrequency. current, this method giving an almost unllmited degree oftemperature control for the pu ose of meltlng a great variety of metalswhile the temperature of the outside of the device is not raisedymaterially. u I

It is a further object of my 1nvent1on to provide a metal spray deviceof llght structure which can be conveniently operated at a distance fromthe source of electrical energy.

An object of my invention is to provide a means for feeding the metal tobe fused.

Another object of my invention is to provide novel and improved coolingmeans for my device.

A further obiect of my invention 1s to provideV means for controllingthe temperature,

velocity and application of the spraying blast of air or as.

Other o jects of my invention vill appear in the accompanyingspecification and claims and will be disclosed in the accompanyingdrawings in which Fig. 1 isa longitudinal section of my melting furnaceand blast nozzle.

Fig. 2 is a detail view in section illustrating l a modification of theinner tube.

, Fi 3 is a similar view of still another modificatlon of the tube.

Fig. 4 illustrates two of my devices adjustably mounted on a singleframe.

Fig. 5 is a view of the metal feeding devlce used in connectionherewith.

Fig. 6 is a detail view of the driving mechanism for the knurled roll.

Fig. 7 is a detail sectional view of the i knurled roll and adjacentparts and Fig. 8 is 'a side elevation showing a furnace and a blastnozzle constructedv separately.

Fig. 9 is a side elevation, partly diagrammatical, showing my assembleddevice.

Referring now with greater particularity to the drawings it will be seenthat my device is com rised as follows:

' T e metal spray device includes a casing 1 in which the operatingparts are housed, the vingha pistol grip pr other suitable handle 2 fort e manipulation of the device.

The furnace or melting apparatus is en- 1925. Serial N0. 28,925.

closed in the casing 1 and consists of an outer' casmg 3 of heat andelectric insulating material. A hollow tube 4 of electro-insulatingmaterial 1s mounted centrally of the casing 3 and spaced therefrom byVglands 5 and 6 which are erforated at 7 to permit of the passage of t eblast gases as will hereinafter be disclosed. Mounted on the tube 4 is acoil 8 of copper or other electro-conductive material wound spirallywith an increasingly great number of turns to each unit of length as itapproaches the nozzle 9 of the device. The material of the coil 8 isbandular in structure the bands being wound edgewise upon the tube 4.The forward end of the tube 4 is coniform in shape to conform to thenozzle 9.

The nozzle 9 is djustably screw threadedly/- ymay be opened at will topermit the passage of blast gas along the passage oftube 4. A tube 23 isprovided with valve 24 to control the passage of gas along the annularspace between the tube 4 and the casing 3.

The high frequency current is secured from a standard light weight highfrequency apparatus 25 and is conducted to the furnace by leads 15 and16.

The gas or air to 4cool the furnace and to furnish the blast forspraying is obtained from any suitable source 26 and is fed. to thefurnace through flexible tubes 27 and 28. In Figures 5 and 6 the wirefeeding apparatus is disclosed diagrammatically at 29 though itispreferably inclosed in the casing to the r'ear of the furnace vas laterdisclosed.

Having vreference now especially to Figures 5, 6 and `7, my wire feedingdevice will be disclosed. g. u

In this structure the drive shaft 30 mounted in suitable bearings 31passes up through the pistol grip, 2 into the casing 1. The

vide a worm for driving a worm ear 32 for rotating through the medium ,oreducing or planetary gears 33, a gear 34 xedly upper end of the shaft30 is formed to pronozzle 46 on lead 47.

said collar 35. A second knurled roll 38 is mounted on a shaft 39 whichis held in a yoke 40 pivotally secured to a shaft 41. 'lhe'roll 38 1spressed toward the roll 37 by sppngpressed plungers 40 held 1n sleeves4L adjustably screW-threadedly secured 1n the cover 42 of the casing l.The casing cover 42 is pivoted to the body of the casing at 43 and isheld in closed position by a spring latch 44.

The driving shaft has mounted thereon a turbine wheel 45 which isadapted to he rotated by high pressure gas issuing from a 'lhe gas fiowmay be controlled by a valve 48.

When the Wire to be melted is of heavy stock or when other Condit-ionsrender the use of an electric drive preferable to a turbine drivethe'wire may be fed by an electric.r motor 49 driving the shaft througha flexible shaft 50.

Figure 8 shows a modification of my device in Which the inductionfurnace for melting the 'metal is formed separately from the device foratomizing the molten metal. At 7 3 I have shown a furnace of theNo'rthrup type 73 with a gas blast nozzle 7'5 positioned at an anglethereto and adjustable 111 angular relation thereto by means of a link78, to control the degree of fincncss of the coatmg sprayed. h

The operation of my device will be understood to be as follows: .The gasblast is first put into operation by the .opening of the valve leadingto the passages and the nozzle is adjusted to give the desired cone ofdispersion. The high frequency current is then put into operation andthewire feeding apparatus started. As the wlre enters the rear of thefurnace induction or eddy currents are set up in it causing it to risein temperature. As the Wire progresses toward the nozzle 1t is subjectedto the continued action of the coils which, as the wire approaches thenozzle,

are of an increasingly great number of turns,l

until the metal is melted. The blast of gases through the passageways 7and the bore of the tube 4 force the fused metal out of the nozzle anddeposit the same on the material to be coated.

The gases passing through the annular pas- Sagevvay between the coil andthe casing 3 and through the bore of tube 4 tends to cool the.apparatus. The ease of control of the high frequency1 apparatus makesthe control ofthe temperature of the furnace governable.

to the extent that metals of a wide range'of points can be sprayed bythis apparatus. The Wire to be fused may be fed by either of the drivesources, the rotation of the driving shaft resulting in the rotation ofthe knurled feed rolls to feed the Wire. The adjustably held springpressed plungers permit adjustment of the rolls to accommodate varioussizes of stock, the spring holding the upper roll tightly in engagementwith the stock.

The gas blast may be used through either the annular passageway or thebore of the tube4, or both, depending upon the nature of thc materialand characteristics vof the coating desired. '.lhe gas to be fed throughthe bore of the tube 4 may be heated if desired and it may be either aninert gas or an oxidizing one depending upon the nature of the coatingdesired.

In the modification shown in Figure 2 I have provided a lining 60 ofelectro-conducted material Within and throughout the length of the core4. In this type of furnace thel lining 6() will be heated to a highdegree by induction and will melt the metal by radiation. In thestructure shown in Figure 3 I have shown a lining 60 of conductivematerial extending for a portion of the length of said core and at therearward portion thereof. This liningA serves to heat the met-al to acertain extent by radiation and also serves as a means for heating gasblasts which may be passed through the core of the tube 4.

I claim:

1. In a metal spraying device, a casing, a high frequency inductionfurnace within said casing, means for continuously feeding the metal tobe sprayed into said furnace, and means for spraying the molten metal.

2. In a metal spraying device, a casing, a

high frequency induction furnace Within saidl casing and spacedtherefromto provide passages, means for continuously feeding the metaltobe sprayed into said furnace, and

-means for causing a blast of gas to pass be sprayed :into said core,and means for spraying said metal when molten. V

4. In a metal spraying device, a casing, a blast nozzle adjustablysecured to said casing, a high frequency induction furnace Within saidcasing and spaced therefrom to provide cooling passages, said highfrequency furnace comprising an insulating core Wound with an increasingnumber of turns of conductive material per linear unit from rear tofront, means for continuously feeding the metal to be sprayed into saidcore, and means for causing a blast of gas to pass through said passagesfor the purposes described. 5. In a metal spraying device, a casing, ablast nozzle adjustably secured to said casing, a high frequencyinduction furnace within said casing and spaced therefrom to rovidecooling passages, said high frequency urnace comprising an insulatingcore Wound with an increasing number of turns of conductive material perlinear unit from rear to front,

`means for continuously feeding the metal t0 meinen means forcontinuously feeding the metal to be sprayed into said core, and meansfor causing a blast of gas to pass through said essages and said corefor the ur es descri ed.

6. In a' meta-l spraying ev1ce, a casing, en electricinduction furnacewithin said casing, means for continuously feeding the metal to besprayed into said furnace, and means for spraying molten motel. v

7. En e motel spying device, n casing, n. high frequency inductionfurnace within seid casing, moons for continuously eeg the motel to besprayed into said fum, means vfor sprayin the molten met, and L E forcooling sei fum,

In testimony whereof In

